Figure 3. Levels of COI1 transcripts (a) and jasmonic acid (JA, b) in leaves of ‘receiver' tomato plants in response to common mycorrhizal networks (CMNs) connected with MeJA-treated neighbouring tomatoes.

Funneliformis mosseae was used to establish CMNs between ‘donor' and ‘receiver' tomatoes. Leaves of each ‘donor' plant were sprayed with 1 ml MeJA (1 mM) or buffer (treatment D). Quantitative real time RT-PCR was used to detect the transcripts of COI1. Four treatments (A, B, C, D) were set up as described in Table 1. Values are means + standard error from three sets of independent experiments with three pots per treatment for each set of experiments. For each time point, letters above bars indicate significant difference among treatments (P < 0.05 according to Tukey's multiple range test). Results of ANOVA analysis are presented in the Supporting Information (Table S6).